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developrnent alternative, a pump station will likely be constructed on each pipeline at separate hydraulically significant positions on Davis Point. applicable standards: "The Williams Companies Ons{rare Pipeline Construction Specifications" (9 June 1997) (attached) is The Williars Companies' standard contract document for pipeline construction. The Williams Companies specifications meet or exceed DOT (49 CFR Part 195) standards and also provide more detailed construction specifications that are consistent with the requirements of the DOT standards. Because the DOT pipeline standards apply specifically to transportation of hazardous liquids by pipeline, some of the standards may not be appropriate or necessary for the Arerican Soda project pipelines. In addition, because of the insulationlcoating on the pipes and other features, the pipes may need to be handled differently than regular steel pipe. American Soda is currently developing a Plan of Development (POD) for the pipeline. The POD will identify the specific standards and specifications for the design and construction of the pipeline and will be provided to WCC and BLM upon cornpletion. Although the pipeline will be designed and constructed in accordance with applicable parts of the DOT standards, the pipeline will not be regulated by DOT and consequently will not be operated under DOT operating standards. typical cross-sections: A typical trench cross-section is attached (Williams Pipe Line Company Drawing Number STD-1010 Trench and Backfill Requirements). Note that the disposal of the mound of material labeled "trench soil" is addressed in our response to item 29. general construction methods: The pipeline trench will be 72 to 80 inches wide and 54 to 60 inches deep. There will be 6 inches of bedding under the pipe and 30 to 36 inches of topsoil above the pipe, depending on the presence of sock substrate. Expansion joints will be placed at approximately one-half- to 1-mile intervals along the pipeline. See "The Williams Corpanies Onshore Pipeline Construction Specifications" (9 June 1997). methods in sensitive/difficult areas (rugged topography, sideslopes, blasting, wetlands, waterbodies): Tire product and water return pipelines will be placed in separate bores (holes drilled by boring) 10 feet apart under roads, with the pipelines buried 4 feet deep at each road crossing. All stream crossings and wetland crossings will be open cret. Strearns will be terporarily darnrned to allow corrstnrction across the chnnnel, or active streams may be diverted temporarily if flows nre too great. Stream and zuetlnnd crossings will be constnrcted such that there zoill be 5 feet of cover frorn the top of the pipe to the bottom of the restored streambed. See "The Williams Companies Onshore Pipeline Construction Specifications" (9 June 1997). 10